Templater: Combine Change and Commit id templates

They will both need the unique prefix functionality.

Change ids previously were just strings.

src/template_parser.rs

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use jujutsu_lib::backend::{CommitId, Signature, Timestamp};
+use jujutsu_lib::backend::{Signature, Timestamp};
 use jujutsu_lib::commit::Commit;
 use jujutsu_lib::op_store::WorkspaceId;
 use jujutsu_lib::repo::RepoRef;
@@ -22,12 +22,12 @@ use pest_derive::Parser;
 
 use crate::formatter::PlainTextFormatter;
 use crate::templater::{
-    AuthorProperty, BranchProperty, ChangeIdProperty, CommitIdKeyword, CommitterProperty,
-    ConditionalTemplate, ConflictProperty, ConstantTemplateProperty, DescriptionProperty,
-    DivergentProperty, DynamicLabelTemplate, EmptyProperty, GitRefsProperty, IsGitHeadProperty,
-    IsWorkingCopyProperty, LabelTemplate, ListTemplate, LiteralTemplate, SignatureTimestamp,
-    StringPropertyTemplate, TagProperty, Template, TemplateFunction, TemplateProperty,
-    WorkingCopiesProperty,
+    AuthorProperty, BranchProperty, CommitOrChangeId, CommitOrChangeIdKeyword,
+    CommitOrChangeIdShortest, CommitterProperty, ConditionalTemplate, ConflictProperty,
+    ConstantTemplateProperty, DescriptionProperty, DivergentProperty, DynamicLabelTemplate,
+    EmptyProperty, GitRefsProperty, IsGitHeadProperty, IsWorkingCopyProperty, LabelTemplate,
+    ListTemplate, LiteralTemplate, SignatureTimestamp, StringPropertyTemplate, TagProperty,
+    Template, TemplateFunction, TemplateProperty, WorkingCopiesProperty,
 };
 use crate::time_util;
 
@@ -71,14 +71,6 @@ impl TemplateProperty<String, String> for StringFirstLine {
     }
 }
 
-struct CommitIdShortest;
-
-impl TemplateProperty<CommitId, String> for CommitIdShortest {
-    fn extract(&self, context: &CommitId) -> String {
-        CommitIdKeyword::shortest_format(context.clone())
-    }
-}
-
 struct SignatureName;
 
 impl TemplateProperty<Signature, String> for SignatureName {
@@ -106,7 +98,7 @@ impl TemplateProperty<Timestamp, String> for RelativeTimestampString {
 enum Property<'a, I> {
     String(Box<dyn TemplateProperty<I, String> + 'a>),
     Boolean(Box<dyn TemplateProperty<I, bool> + 'a>),
-    CommitId(Box<dyn TemplateProperty<I, CommitId> + 'a>),
+    CommitOrChangeId(Box<dyn TemplateProperty<I, CommitOrChangeId> + 'a>),
     Signature(Box<dyn TemplateProperty<I, Signature> + 'a>),
     Timestamp(Box<dyn TemplateProperty<I, Timestamp> + 'a>),
 }
@@ -122,10 +114,9 @@ impl<'a, I: 'a> Property<'a, I> {
                 first,
                 Box::new(move |value| property.extract(&value)),
             ))),
-            Property::CommitId(property) => Property::CommitId(Box::new(TemplateFunction::new(
-                first,
-                Box::new(move |value| property.extract(&value)),
-            ))),
+            Property::CommitOrChangeId(property) => Property::CommitOrChangeId(Box::new(
+                TemplateFunction::new(first, Box::new(move |value| property.extract(&value))),
+            )),
             Property::Signature(property) => Property::Signature(Box::new(TemplateFunction::new(
                 first,
                 Box::new(move |value| property.extract(&value)),
@@ -163,8 +154,9 @@ fn parse_method_chain<'a, I: 'a>(
                 let PropertyAndLabels(next_method, labels) = parse_boolean_method(method);
                 (next_method.after(property), labels)
             }
-            Property::CommitId(property) => {
-                let PropertyAndLabels(next_method, labels) = parse_commit_id_method(method);
+            Property::CommitOrChangeId(property) => {
+                let PropertyAndLabels(next_method, labels) =
+                    parse_commit_or_chain_id_method(method);
                 (next_method.after(property), labels)
             }
             Property::Signature(property) => {
@@ -207,14 +199,16 @@ fn parse_boolean_method<'a>(method: Pair<Rule>) -> PropertyAndLabels<'a, bool> {
 
 // TODO: pass a context to the returned function (we need the repo to find the
 //       shortest unambiguous prefix)
-fn parse_commit_id_method<'a>(method: Pair<Rule>) -> PropertyAndLabels<'a, CommitId> {
+fn parse_commit_or_chain_id_method<'a>(
+    method: Pair<Rule>,
+) -> PropertyAndLabels<'a, CommitOrChangeId> {
     assert_eq!(method.as_rule(), Rule::method);
     let mut inner = method.into_inner();
     let name = inner.next().unwrap();
     // TODO: validate arguments
 
     let this_function = match name.as_str() {
-        "short" => Property::String(Box::new(CommitIdShortest)),
+        "short" => Property::String(Box::new(CommitOrChangeIdShortest)),
         name => panic!("no such commit ID method: {name}"),
     };
     let chain_method = inner.last().unwrap();
@@ -261,8 +255,8 @@ fn parse_commit_keyword<'a>(
     assert_eq!(pair.as_rule(), Rule::identifier);
     let property = match pair.as_str() {
         "description" => Property::String(Box::new(DescriptionProperty)),
-        "change_id" => Property::String(Box::new(ChangeIdProperty)),
-        "commit_id" => Property::CommitId(Box::new(CommitIdKeyword)),
+        "change_id" => Property::CommitOrChangeId(Box::new(CommitOrChangeIdKeyword::change())),
+        "commit_id" => Property::CommitOrChangeId(Box::new(CommitOrChangeIdKeyword::commit())),
         "author" => Property::Signature(Box::new(AuthorProperty)),
         "committer" => Property::Signature(Box::new(CommitterProperty)),
         "working_copies" => Property::String(Box::new(WorkingCopiesProperty { repo })),
@@ -291,9 +285,9 @@ fn coerce_to_string<'a, I: 'a>(
             property,
             Box::new(|value| String::from(if value { "true" } else { "false" })),
         )),
-        Property::CommitId(property) => Box::new(TemplateFunction::new(
+        Property::CommitOrChangeId(property) => Box::new(TemplateFunction::new(
             property,
-            Box::new(CommitIdKeyword::default_format),
+            Box::new(CommitOrChangeIdKeyword::default_format),
         )),
         Property::Signature(property) => Box::new(TemplateFunction::new(
             property,

src/templater.rs

@@ -155,14 +155,6 @@ impl<'a, C> Template<C> for StringPropertyTemplate<'a, C> {
     }
 }
 
-pub struct ChangeIdProperty;
-
-impl TemplateProperty<Commit, String> for ChangeIdProperty {
-    fn extract(&self, context: &Commit) -> String {
-        context.change_id().hex()
-    }
-}
-
 pub struct DescriptionProperty;
 
 impl TemplateProperty<Commit, String> for DescriptionProperty {
@@ -415,22 +407,59 @@ impl<'a, C, I, O> TemplateProperty<C, O> for TemplateFunction<'a, C, I, O> {
     }
 }
 
-pub struct CommitIdKeyword;
+#[derive(Debug, Clone)]
+pub enum CommitOrChangeId {
+    CommitId(CommitId),
+    ChangeId(ChangeId),
+}
 
-impl CommitIdKeyword {
-    pub fn default_format(commit_id: CommitId) -> String {
-        commit_id.hex()
-    }
-
-    pub fn shortest_format(commit_id: CommitId) -> String {
-        // TODO: make this actually be the shortest unambiguous prefix
-        commit_id.hex()[..12].to_string()
+impl CommitOrChangeId {
+    pub fn hex(&self) -> String {
+        match self {
+            CommitOrChangeId::CommitId(id) => id.hex(),
+            CommitOrChangeId::ChangeId(id) => id.hex(),
+        }
     }
 }
 
-impl TemplateProperty<Commit, CommitId> for CommitIdKeyword {
-    fn extract(&self, context: &Commit) -> CommitId {
-        context.id().clone()
+#[derive(Debug, Clone)]
+enum CommitOrChange {
+    Commit,
+    Change,
+}
+
+pub struct CommitOrChangeIdKeyword(CommitOrChange);
+
+impl CommitOrChangeIdKeyword {
+    pub fn commit() -> Self {
+        Self(CommitOrChange::Commit)
+    }
+    pub fn change() -> Self {
+        Self(CommitOrChange::Change)
+    }
+    pub fn default_format(commit_or_change_id: CommitOrChangeId) -> String {
+        commit_or_change_id.hex()
+    }
+
+    pub fn shortest_format(commit_or_change_id: CommitOrChangeId) -> String {
+        commit_or_change_id.hex()[..12].to_string()
+    }
+}
+
+pub struct CommitOrChangeIdShortest;
+
+impl TemplateProperty<CommitOrChangeId, String> for CommitOrChangeIdShortest {
+    fn extract(&self, context: &CommitOrChangeId) -> String {
+        CommitOrChangeIdKeyword::shortest_format(context.clone())
+    }
+}
+
+impl TemplateProperty<Commit, CommitOrChangeId> for CommitOrChangeIdKeyword {
+    fn extract(&self, context: &Commit) -> CommitOrChangeId {
+        match &self.0 {
+            CommitOrChange::Commit => CommitOrChangeId::CommitId(context.id().clone()),
+            CommitOrChange::Change => CommitOrChangeId::ChangeId(context.change_id().clone()),
+        }
     }
 }